1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
|
/* Copyright (C) 2001-2007 Peter Selinger.
* This file is part of Potrace. It is free software and it is covered
* by the GNU General Public License. See the file COPYING for details.
*/
#include <stdlib.h>
#include <string.h>
#include <potracelib.h>
#include <curve.h>
#include <decompose.h>
#include <trace.h>
#include <progress.h>
#include <potrace_version.h>
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
/* default parameters */
static const potrace_param_t param_default =
{
2, /* turdsize */
POTRACE_TURNPOLICY_MINORITY, /* turnpolicy */
1.0, /* alphamax */
1, /* opticurve */
0.2, /* opttolerance */
{
NULL, /* callback function */
NULL, /* callback data */
0.0, 1.0, /* progress range */
0.0, /* granularity */
},
};
/* Return a fresh copy of the set of default parameters, or NULL on
* failure with errno set. */
potrace_param_t* potrace_param_default( void )
{
potrace_param_t* p;
p = (potrace_param_t*) malloc( sizeof(potrace_param_t) );
if( !p )
{
return NULL;
}
memcpy( p, ¶m_default, sizeof(potrace_param_t) );
return p;
}
/* On success, returns a Potrace state st with st->status ==
* POTRACE_STATUS_OK. On failure, returns NULL if no Potrace state
* could be created (with errno set), or returns an incomplete Potrace
* state (with st->status == POTRACE_STATUS_INCOMPLETE). Complete or
* incomplete Potrace state can be freed with potrace_state_free(). */
potrace_state_t* potrace_trace( const potrace_param_t* param, const potrace_bitmap_t* bm )
{
int r;
path_t* plist = NULL;
potrace_state_t* st;
progress_t prog;
progress_t subprog;
/* prepare private progress bar state */
prog.callback = param->progress.callback;
prog.data = param->progress.data;
prog.min = param->progress.min;
prog.max = param->progress.max;
prog.epsilon = param->progress.epsilon;
prog.d_prev = param->progress.min;
/* allocate state object */
st = (potrace_state_t*) malloc( sizeof(potrace_state_t) );
if( !st )
{
return NULL;
}
progress_subrange_start( 0.0, 0.1, &prog, &subprog );
/* process the image */
r = bm_to_pathlist( bm, &plist, param, &subprog );
if( r )
{
free( st );
return NULL;
}
st->status = POTRACE_STATUS_OK;
st->plist = plist;
st->priv = NULL; /* private state currently unused */
progress_subrange_end( &prog, &subprog );
progress_subrange_start( 0.1, 1.0, &prog, &subprog );
/* partial success. */
r = process_path( plist, param, &subprog );
if( r )
{
st->status = POTRACE_STATUS_INCOMPLETE;
}
progress_subrange_end( &prog, &subprog );
return st;
}
/* free a Potrace state, without disturbing errno. */
void potrace_state_free( potrace_state_t* st )
{
pathlist_free( st->plist );
free( st );
}
/* free a parameter list, without disturbing errno. */
void potrace_param_free( potrace_param_t* p )
{
free( p );
}
const char* potrace_version( void )
{
return POTRACELIB_VERSION;
}
|
